Combined expansion and contraction joint



March 3 A. c. FISCHER 1,902,944

COMBINED EXPANSION AND CONTRACTION JOINT Fi'led May 19, 1927 Patented Man. 28,

UNFTED s'ra'rss PATENT OFFICE} ALBERT G. FISCHER OI CHICAGO, ILLINOIS, ASSIGNOB TO THE PHILIP CAREY mu- FAGTURIN'G COMPANY, A CORPORATION OF OHIO comamnn nxransron am) coN'raAc'rIon JOINT Application filed May 19,

Heretofore, in concrete paving where contraction was to be provided for it has been the practice to insert a piece of metal long1- tudinally or transversely below the surface,

5 sothat when the concrete block or slab is fully poured and com leted the contraction joint is not visible at t e surface. After the concrete sets and contracts the function of these pieces of metal is to cause a very fine crevice to develop thru the entire slab, so that it becomes visible on the surface, and functioning in this way it is styled a contraction joint. Further development. in this style of alcrete pavements can be made in which a wedge or-an lar formation is provided, so that the pro ections developing in one concrete slab, by reason of filling in these projections in the contraction joint, penetrate the other slab so that resistance is caused to any lifting action on the part of the concrete slab. Some of these formations have been angular and some half hexagonal in shape, with straight flanges extending on either side in a vertical osition when placed. These contraction jomts, while causing the crevice to form along a straight line across the concrete slab or in the surface above which the contraction point is inserted, do not prevent the in ess' of water, street acids and the like, w ich would tend to hastily corrode the metal contraction joint, and also enter the subsoil underneath the slab, keeping the subsoil in the crevice in a constantly wet damp condition.

My invention provides for an improved contraction joint which has many advantages and which also provides for the waterproofing of the contraction joint automatically, as well as allowing a better pivot motion on the rojection anchor in the adjoinin slab. This is caused b the insertion of a bituminous slab of varying thickness, depending upon the requirements. The contraction joint flanges are embedded'in the bituminous slab on either-side of the projecting center. This not only tends to preserve the metal flanges but also has a tendency to protect the projection, because in expanding lowing for expansion and contraction in concontraction joint coated on both sides with a 1027. Serial No. 192,7101

in warm weather some of this bituminous material will find its way-along the surface of the uncovered metal.

A metal contraction joint ma advantageously be coated with paint or ituminous material, in addition to the projecting slabs of bituminous material acting both as expansion and contraction joints.

Expansion joints have usually been placed so thatthe upper edge of the joint was visible on the surface of the pavement, and in many cases was allowed to project above the surface, so that the traflic would form a sort of mushroom top over the crevice.

It can be readily understood that the purpose of this invention is to totally submerge both the contraction and expansion parts of this join-t beneath the surface, so that when theconcrete is finished and poured it will not be visible on the surface butwill accomplish the same function, in causing a crevice to form across the surface, due to contraction. It will further. function b waterproofing this crevice from within, an upon expansion of the bituminous material, and also the pavement, it will cause the asphaltic substance to work its way up to the crevice, so that aftera hot period the bituminous material ma often work its way to the surface, 1 while t e base part will have a tendency to so prevent moisture from coming up, filling the v crevice from below, and in this manner the entire crevice will be kept waterproof and at the same time perform both the functions of an expansion joint and a contraction joint.

In the drawing Figure 1 indicates the first form of my invention disclosing a metallic bituminous material forming an ex ansion joint, the opposite ends of the metal ic con-v traction joint projecting into and being anchored into upper and lower slabs of bituminous material. a

Figure 2 is a modified form wherein the contraction joint of metal or other material is coated with paint or bituminous material on both sides thereof, which coating in and of itself forms the expansion joint.

Referring now to Figure 1 in detail; this type of my joint is shown as comprising a contraction joint preferably formed of metal and arranged so as to provide upper and lower flanges 2 and 4 respectively, preferably 6 in the same plane, the intermediate portion of the metallic contraction joint being'formed or bent to one side'thereof to provide an' in-.

termediate portion which is substantially parallel with the flanged portions 2 and 4, and

The intermediate portions 6 and 8 of the con-' traction joint are covered or coated with a coating of bituminous material 16, preferably on both sides thereof, which coatin forms the expansion joint portion of the device.

Referring now to Figure 2. It will be noted that this form of my invention is substantially identical to Figure 1, except that the upper 80 and lower flanges are not imbedded in bituminous slabs.

In Figure 2 the metallic contraction portion is indicated by the reference numeral 18, and the coating of bituminous material by reference numeral 20. Since the cross-section is similar to that shown in Figure 1 a detail. reference thereto is not thought to be necessa 1 t, of course, must be obvious that the me- 40 tallic contraction strip 18 may either be coated .on one or both sides in any desired manner. Manifestly this joint may be used as an lower edges of the stri being capped with bituminous slabs and't e intermediate portion of the strip being coated with a relatively v thick layer of bituminous material. 7

3. A combined expansion and contraction joint adapted to interlock monolithic sections I comprisin upper an lower flanges lying in the same plane, the intermediate portion of the strip eing bent laterally to provide an intermea flexible metallic strip having diate portion lying 311 a plane upwardly to.

I nous slabs and the intermediate portion of the strip carrying a relatively thick coating of bituminous material.

Si ned at Chicago, Illinois, this 14th day of ay 1927. ALBERT ,C, 1 FISCHER.

expansion joint and laid with its upper edge I flush with the concrete, or protruding there- 4 above if desired. 7

This application contains subject matter disclosed but not claimed in my Patent No. 1,655,835, dated January 10, 1928, which bears the filing date'of January 3, 1922.

I claim: 1. A combined expansion and contraction joint adapted to interlock monolithic sections comprising a flexible, metallic strip having upper and o intermediateportion lying to one side of such planes, the flanged portions. being capped 7 55 videa convex concave section, the upper and wer flanged portions lying in sub- 55 stantially the same plane and joined by an 

